Miner&#39;s incandescent safety lamp



Patented July 27, 1926.

UNITED STATES PATENT OFFICE.

LOUIS ERNEST FRANCOIS FERRET'IE, OF PARIS, FRANCE.

MINERS INCANDESGENT SAFETY LAMP.

Application filed July 28, 1923, Serial No. 654,424, and in FranceAugust 12, 1922.

This invention has reference to a miners incandescent safety lamp inwhich benzine, petrol or other oils may be used as the combustible, theincandescent light being produced by a mantle. I

The object of the present invention is to provide improvements in theconstruction of a lamp of the kind referred to.

According to the present invention 1 provide a miners incandescentsafety lamp, wherein the burner flame and the intensity of light areregulated by controlling the supply of combustible admitted to avapourizer and wherein the combustible vapours are filtered before beingadmitted to the burner, the said combustible being also subjected to thepressure caused by a pump arranged in the lamp reservoir.

Reference is now made to the annexed drawings wherein is illustrated byway of example, one form of lamp constructed in accordance with thepresent invention.

Referring to the drawings The figure is a vertical sectional view of thelamp.

Referring to the drawing the lamp reservoir 1 is provided with a tube 2,wherein the bottom part of a valve 3 is arranged, said valve comprisinga needle 4: operated by a lever 5 projecting out of the bottom of thereservoir 1. A union 6 connects the valve 3 to a tube 7 arranged withinthe said reservoir and provided with a gauze 8 for filtering thecombustible.

The valve 3 is provided with a three connection union 9, connected withone end of a coil vapourizer 10, the other end of said vapourizer, whichis also provided with a three connection joint 11, being fixed to theupper part of the gas tube 12. The latter is provided in its interiorwith a metallic filter 13, which can be easily removed by iiieans of ascrewed plug, 14:, when the lamp is opened. The gas tube 12 is providedwith a branch 15 having a nozzle holder 16 wherein is screwed a nozzle17. The latter is fitted with a Bunsen burner 18 which is held in placeby a collar 19 supported by the union 9 and the gas tube 12. A mantle 20is arranged above the burner 18 and is supported by a rod 21, fixed in amantle holder 22 by a screw 23.

The pressure necessary for the feeding of the combustible to the lampburner is obtained by means of a pump provided in the reservoir 1 andcomprising a body 25 in the interior of which a piston 26, having aleather cup 27 fixed at the end of a hollow rod 28, is movably arranged.

The piston rod 28 is provided with a knob 2 1 which is uncovered by thethumb of the operator at the time of the intake of air (i. e. theoutstroke of the piston) so as to allow the air to enter the pumpthrough the rod 28, the said knob being covered by the thumb on theinstroke of the piston. The air compressed by the pump opens a valve 29held against a valve seat 30 by a spiral spring 31, the stem of thevalve being slidably guided in an aperture 32 formed in the wall of achamber 33 enclosing the valve and valve seat.

A safety valve, situated at the top part of I the reservoir 1, comprisesa seat 34: whereon is arranged a sheet lead disc 35 on the edges ofwhich rests the flange 36 of a cup 37 provided, at its central part,with a needle or piercing device 38 and held down on the disc 35 bymeans of a nut 39. The cup 37 is formed with a small hole 10 whichallows the pressure within the reservoir 1 to drop w8hen the disc 35 isperforated by the needle 3 Air necessary for the combustion of the fuelpasses into the interior of the lamp through two metallic gauze filters41, and a guard 42, serving to protect the parts of the lamp, is securedto the lower portion of the upper part of the lamp.

When the lamp has been provided with the combustible, in order to obtainthe required pressure within the reservoir 1, a certain number ofstrokes are made with the pump piston 26, the passage in the piston rod28 being closed on the instroke by placing the thumb over the button2 1. \Vhen the vapourizer coil 10 is sufiiciently heated, the lever 5 ofthe needle 4 is rotated so as to allow the combustible, after risingthrough the tube 7 to pass into the said vapourizer coil 10 which lattermay be heated in any known suitable manner.

The combustible is vapourized as it passes through the coil 10 and thevapours are led through the gas tube 12 where they are filtered by thefilter 13 before reaching the nozzle 17. After passing through the saidnozzle, the gases flow into the burner 18, drawing the air necessary fortheir combustion through openings provided in the lower part of theburner, and are burnt at the upper part of the burner.

The mantle is very quickly raised to incandescence, the duration ofworking of the lamp depending upon the amount of combustible in thereservoir 1. The intensity of the light can be varied at any time bymoving the needle valve 4 towards or away from its seat.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is l. A miners incandescentsafety lamp, comprising a baseproviding a fuel reser voir, a feed tube opening into the reservoir, avalve operable from beyond the reservoir and controlling the flowthrough the feed tube, a burner section mounted above the reservoir, aBunsen burner supported in said section, an incandescent mantlesupported above the burner, a vaporizing tube coiled about the mantleand open to the supply from the feed tube, a metallic filter arrangedbetween the vaporizing tube and Bunsen burner, and a guard sectiondepending from the burner section and open at the lower edgefor theadmission of air to the burner.

2. A miners incandescent safety lamp, comprising a base providing a fuelreservoir, a feed tube opening into the reservoir, a filter at the inletend of such tube, a valve operable from beyond the reservoir andcontrolling the flow through the feed tube, a burner section mountedabove the reservoir, a supporting collar carried by the burner section,a Bunsen burner supported on said collar, an incandescent mantlesupported above the burner, a vaporizing tube coiled about the mantleand open to the supply from the feed tube, said tube being supported bysaid collar and a metallic filter arranged between the vaporizing tubeand Bunsen burner.

8. A miners incandescent safety lamp, comprising a base providing a fuelreservoir, a feed tube opening intothe reservoir, a valve operable frombeyond the reservoir and controlling the flowthrough the feed tube, aburner section mounted above the reservoir, 'a guard intermediate thereservoir and burner section and open to the atmosphere, a Bunsen burnersupported in said section, the burner section being formed with an airopening underlying the burner, gauze filters in said opening, anincandescent mantle supported above the burner, a vaporizing tube coiledabout the mantle and open to the supply from the feed tube, and ametallic filter arranged between the vaporizing tube and Bunsen burner.

in testimony whereof I atlix my signature.

LOUIS ERNEST FRANQOlS FERRETTE.

